A heater of 400 Watt was on for 5 hours what is electrical Consumption
Correct answer: C. 2 KWh
- A. 20 KWh
- B. 12 KWh
- C. 2 KWh
- D. None of the above
Explanation
To determine the electrical consumption, first convert the power from Watts to kilowatts: 400 Watts is equal to 0.4 kW. Then multiply the power by the time the heater was on: 0.4 kW x 5 hours = 2 kWh. Therefore, the correct answer is 2 KWh.Option A (20 KWh) is incorrect because it assumes an erroneous power usage of 4000 Watts, which is not given. Option B (12 KWh) is incorrect due to an incorrect power conversion to 2.4 kW. Option D ('None of the above') is incorrect because a valid solution exists with the provided information, which is 2 kWh.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Current Electricity questions
The change in resistance of metallic conductor below 0oC?
When a wire is compressed and its radius becomes 2R then its resistance will be:
You are given four bulbs of 25W, 40W, 50W and 60W. Which bulb has the lowest resistance?
When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
Resistance of tungsten wire at 150 oC is 133Ω. Its resistance temperature coefficient is 0.0045/oC. The resistance of this wire at 500oC will be:
A wire of uniform area of cross section is cut into two parts of equal lengths. The resistivity of any part